2010 Kawasaki KX250F Owners Manual - Page 139

138 TROUBLESHOOTING GUIDE Clutch not disengaging properly: Clutch lever play excessive Clutch spring tension uneven Engine oil deteriorated Engine oil viscosity too high Engine oil level too high Clutch housing frozen on drive shaft Clutch release mechanism defective Clutch hub nut loose Clutch plate warped or rough Clutch hub spline damaged j dogs and/or dog grooves worn • Gear Shift drum groove worn • Gear positioning lever spring broken or weak • Shift fork pin worn • Drive shaft, output shaft, and/or gear splines worn • • Gear positioning lever spring broken or weak • Pawl guide plate worn Engine noise abnormal - Transmission skips gears: Gear shifting faulty Transmission does not go into gear; shift pedal does not return: Clutch not disengaging Shift fork bent or seized Gear stuck on the shaft Shift lever broken Pawl guide plate broken Shift return spring broken or weak Shift return spring pin loose Shift pawl broken Shift pawl spring weak Shift drum broken Transmission jumps out of gear: Shift fork worn Gear groove worn Knocking: Carbon built up in combustion chamber Fuel quality poor or type incorrect Spark plug type incorrect Engine overheating CDI unit defective Piston slap: clearance excessive • Piston Cylinder or piston worn • Connecting bent • Piston pin orrod piston pin holes worn • • • Valve noise: Valve clearance incorrect Valve spring broken or weak Camshaft bearing or cam face worn Valve lifter worn